randuAsync function
RandU Generates a single uniformly-distributed random number or an array of random numbers.
For further details, please see: https://docs.opencv.org/master/d2/de8/group__core__array.html#ga1ba1026dca0807b27057ba6a49d258c0
Implementation
Future<Mat> randuAsync(InputOutputArray dst, Scalar low, Scalar high) async => cvRunAsync0(
(callback) => cffi.RandU_Async(dst.ref, low.ref, high.ref, callback),
(c) => c.complete(dst),
);